Preparing method of electrostatic charge image developing toner and electrostatic charge image developing toner

Patent metadata

Field	Value
Publication number	US-2022299900-A1
Application number	US-202117373915-A
Country	US
Kind code	A1
Filing date	Jul 13, 2021
Priority date	Mar 22, 2021
Publication date	Sep 22, 2022
Grant date	—

Abstract

A preparing method of an electrostatic charge image developing toner includes: aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles; heating and coalescing the aggregated particles to form coalesced particles; and filtering and cleaning the coalesced particles to obtain toner particles, in which before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles.

First claim

What is claimed is:

1 . A preparing method of an electrostatic charge image developing toner, the method comprising:
aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles; heating and coalescing the aggregated particles to form coalesced particles; and filtering and cleaning the coalesced particles to obtain toner particles, wherein before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles.

2 . The preparing method of an electrostatic charge image developing toner according to claim 1 , wherein
the polymer dispersant is at least one compound selected from the group consisting of a formalin condensate sulfonate, a salt of an α-olefin-maleic acid copolymer, and a salt of a styrene-maleic acid copolymer.

3 . The preparing method of an electrostatic charge image developing toner according to claim 2 , wherein
the polymer dispersant is the formalin condensate sulfonate.

4 . The preparing method of an electrostatic charge image developing toner according to claim 1 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.03% by weight or more and 1.3% by weight or less with respect to the total weight of the obtained toner particles.

5 . The preparing method of an electrostatic charge image developing toner according to claim 2 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.03% by weight or more and 1.3% by weight or less with respect to the total weight of the obtained toner particles.

6 . The preparing method of an electrostatic charge image developing toner according to claim 3 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.03% by weight or more and 1.3% by weight or less with respect to the total weight of the obtained toner particles.

7 . The preparing method of an electrostatic charge image developing toner according to claim 4 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.05% by weight or more and 1.0% by weight or less with respect to the total weight of the obtained toner particles.

8 . The preparing method of an electrostatic charge image developing toner according to claim 5 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.05% by weight or more and 1.0% by weight or less with respect to the total weight of the obtained toner particles.

9 . The preparing method of an electrostatic charge image developing toner according to claim 6 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.05% by weight or more and 1.0% by weight or less with respect to the total weight of the obtained toner particles.

10 . The preparing method of an electrostatic charge image developing toner according to claim 1 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

11 . The preparing method of an electrostatic charge image developing toner according to claim 1 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

12 . The preparing method of an electrostatic charge image developing toner according to claim 2 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

13 . The preparing method of an electrostatic charge image developing toner according to claim 3 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

14 . The preparing method of an electrostatic charge image developing toner according to claim 4 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

15 . The preparing method of an electrostatic charge image developing toner according to claim 5 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

16 . The preparing method of an electrostatic charge image developing toner according to claim 6 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

17 . The preparing method of an electrostatic charge image developing toner according to claim 7 , wherein
in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower.

18 . The preparing method of an electrostatic charge image developing toner according to claim 1 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added as an aqueous solution of the polymer dispersant.

19 . The preparing method of an electrostatic charge image developing toner according to claim 18 , wherein
before the aggregating or during the aggregating, the polymer dispersant is added as an aqueous solution of 1% by weight or more and 40% by weight or less of the polymer dispersant.

20 . An electrostatic charge image developing toner which is prepared by the preparing method of an electrostatic charge image developing toner according to claim 1 .

Assignees

• Fujifilm Business Innovation Corp

Inventors

• Saeki Yuta
• Sugawara Atsushi
• Noguchi Daisuke
• Nakamura Kazuhiko
• Nakazawa Hiroshi

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/08782

  Waxes · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/0804 Primary

  whereby the components are brought together in a liquid dispersing medium · CPC title

• G03G9/0823 Primary

  Electric parameters · CPC title